31222400022 has 64 divisors (see below), whose sum is σ = 80143084800. Its totient is φ = 8904781440.

The previous prime is 31222399997. The next prime is 31222400029. The reversal of 31222400022 is 22000422213.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 31222399968 and 31222400004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31222400029) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1535872 + ... + 1556067.

It is an arithmetic number, because the mean of its divisors is an integer number (1252235700).

Almost surely, 2^31222400022 is an apocalyptic number.

31222400022 is an abundant number, since it is smaller than the sum of its proper divisors (48920684778).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31222400022 is a wasteful number, since it uses less digits than its factorization.

31222400022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3091978 (or 3091972 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

Adding to 31222400022 its reverse (22000422213), we get a palindrome (53222822235).

The spelling of 31222400022 in words is "thirty-one billion, two hundred twenty-two million, four hundred thousand, twenty-two".